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btGhostObject.h

/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2008 Erwin Coumans  http://bulletphysics.com

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/

#ifndef BT_GHOST_OBJECT_H
#define BT_GHOST_OBJECT_H


#include "btCollisionObject.h"
#include "BulletCollision/BroadphaseCollision/btOverlappingPairCallback.h"
#include "LinearMath/btAlignedAllocator.h"
#include "BulletCollision/BroadphaseCollision/btOverlappingPairCache.h"
#include "btCollisionWorld.h"

class btConvexShape;

class btDispatcher;

///The btGhostObject can keep track of all objects that are overlapping
///By default, this overlap is based on the AABB
///This is useful for creating a character controller, collision sensors/triggers, explosions etc.
///We plan on adding rayTest and other queries for the btGhostObject
ATTRIBUTE_ALIGNED16(class) btGhostObject : public btCollisionObject
{
protected:

      btAlignedObjectArray<btCollisionObject*> m_overlappingObjects;

public:

      btGhostObject();

      virtual ~btGhostObject();

      void  convexSweepTest(const class btConvexShape* castShape, const btTransform& convexFromWorld, const btTransform& convexToWorld, btCollisionWorld::ConvexResultCallback& resultCallback, btScalar allowedCcdPenetration = 0.f) const;

      void  rayTest(const btVector3& rayFromWorld, const btVector3& rayToWorld, btCollisionWorld::RayResultCallback& resultCallback) const; 

      ///this method is mainly for expert/internal use only.
      virtual void      addOverlappingObjectInternal(btBroadphaseProxy* otherProxy, btBroadphaseProxy* thisProxy=0);
      ///this method is mainly for expert/internal use only.
      virtual void      removeOverlappingObjectInternal(btBroadphaseProxy* otherProxy,btDispatcher* dispatcher,btBroadphaseProxy* thisProxy=0);

      int   getNumOverlappingObjects() const
      {
            return m_overlappingObjects.size();
      }

      btCollisionObject*      getOverlappingObject(int index)
      {
            return m_overlappingObjects[index];
      }

      const btCollisionObject*      getOverlappingObject(int index) const
      {
            return m_overlappingObjects[index];
      }

      btAlignedObjectArray<btCollisionObject*>& getOverlappingPairs()
      {
            return m_overlappingObjects;
      }

      const btAlignedObjectArray<btCollisionObject*>  getOverlappingPairs() const
      {
            return m_overlappingObjects;
      }

      //
      // internal cast
      //

      static const btGhostObject*   upcast(const btCollisionObject* colObj)
      {
            if (colObj->getInternalType()==CO_GHOST_OBJECT)
                  return (const btGhostObject*)colObj;
            return 0;
      }
      static btGhostObject*               upcast(btCollisionObject* colObj)
      {
            if (colObj->getInternalType()==CO_GHOST_OBJECT)
                  return (btGhostObject*)colObj;
            return 0;
      }

};

class btPairCachingGhostObject : public btGhostObject
{
      btHashedOverlappingPairCache* m_hashPairCache;

public:

      btPairCachingGhostObject();

      virtual ~btPairCachingGhostObject();

      ///this method is mainly for expert/internal use only.
      virtual void      addOverlappingObjectInternal(btBroadphaseProxy* otherProxy, btBroadphaseProxy* thisProxy=0);

      virtual void      removeOverlappingObjectInternal(btBroadphaseProxy* otherProxy,btDispatcher* dispatcher,btBroadphaseProxy* thisProxy=0);

      btHashedOverlappingPairCache* getOverlappingPairCache()
      {
            return m_hashPairCache;
      }

};



///The btGhostPairCallback interfaces and forwards adding and removal of overlapping pairs from the btBroadphaseInterface to btGhostObject.
00124 class btGhostPairCallback : public btOverlappingPairCallback
{
      
public:
      btGhostPairCallback()
      {
      }

      virtual ~btGhostPairCallback()
      {
            
      }

      virtual btBroadphasePair*     addOverlappingPair(btBroadphaseProxy* proxy0,btBroadphaseProxy* proxy1)
      {
            btCollisionObject* colObj0 = (btCollisionObject*) proxy0->m_clientObject;
            btCollisionObject* colObj1 = (btCollisionObject*) proxy1->m_clientObject;
            btGhostObject* ghost0 =             btGhostObject::upcast(colObj0);
            btGhostObject* ghost1 =             btGhostObject::upcast(colObj1);
            if (ghost0)
                  ghost0->addOverlappingObjectInternal(proxy1, proxy0);
            if (ghost1)
                  ghost1->addOverlappingObjectInternal(proxy0, proxy1);
            return 0;
      }

      virtual void*     removeOverlappingPair(btBroadphaseProxy* proxy0,btBroadphaseProxy* proxy1,btDispatcher* dispatcher)
      {
            btCollisionObject* colObj0 = (btCollisionObject*) proxy0->m_clientObject;
            btCollisionObject* colObj1 = (btCollisionObject*) proxy1->m_clientObject;
            btGhostObject* ghost0 =             btGhostObject::upcast(colObj0);
            btGhostObject* ghost1 =             btGhostObject::upcast(colObj1);
            if (ghost0)
                  ghost0->removeOverlappingObjectInternal(proxy1,dispatcher,proxy0);
            if (ghost1)
                  ghost1->removeOverlappingObjectInternal(proxy0,dispatcher,proxy1);
            return 0;
      }

      virtual void      removeOverlappingPairsContainingProxy(btBroadphaseProxy* proxy0,btDispatcher* dispatcher)
      {
            btAssert(0);
            //need to keep track of all ghost objects and call them here
            //m_hashPairCache->removeOverlappingPairsContainingProxy(proxy0,dispatcher);
      }

      

};

#endif

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